hard collective stop and throttle pump

[arefim]

Hi guys .I'm trying to learn how to properly do hard collective stop. Some are advising that you have to quickly return to neutral position after your collective movement to be able to have a hard stop but every time I do it on the Simulator I crash because if after a negative collective movement if the heli is inverted and you return to neutral position you do not give enough negative pitch and the heli falls down. Any suggestion how you perform this sudden collective stop. It really looks very cool when I'm seeing it done wright.
thanks

[ArchmageAU]

Originally Posted by arefim

Hi guys .I'm trying to learn how to properly do hard collective stop. Some are advising that you have to quickly return to neutral position after your collective movement to be able to have a hard stop but every time I do it on the Simulator I crash because if after a negative collective movement if the heli is inverted and you return to neutral position you do not give enough negative pitch and the heli falls down. Any suggestion how you perform this sudden collective stop. It really looks very cool when I'm seeing it done wright.
thanks

The hard collective stop is primarily to arrest the momentum. Once that is done, you still need to counter gravity.

Think of it in physics terms. Once the momentum of the heli is arrested (enough momentary acceleration is applied through collective at the right angle to stop any lateral and vertical velocity), gravity will then take over.(as there is no other factors in play). The way we counter gravity with a heli is hovering (flat rotor disc, collective pushing thrust straight down). There are turbulent air factors in play, but by and large you need enough thrust to hover after your stop.

For most hard stop manoeuvres, they are usually followed by other rapid acceleration manoeuvres (rainbow, tic-toc (hardstop to hardstop repeatedly), punch-out, etc..). There may be a momentary pause (for effect), but likely the stop is very transitory.

To answer your question. If hard stop inverted, you still need some negative collective to counter gravity once stopped. Neutral collective in the context given does not mean 0 collective, it means hover collective.

Hope this helps.